Maintenance And Inspection - Hitachi Koki GP 2S2 Instructions De Sécurité Et Mode D'emploi

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MAINTENANCE AND INSPECTION

WARNING:
Be sure to switch power OFF and disconnect the
plug during maintenance and inspection.
Using cracked, deformed or damaged wheels can
lead to wheel breakage and resulting serious
inlury.
1. Inspecting the wheel
Ensure that the wheel is free of cracks and surface
defects.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure
that they are properly tightened. Should any of the
screws be loose, retighten them immediately.
WARNING:
Using this portable grinder with loosened screws
is extremely dangerous.
3. Inspecting the carbon brushes (Fig. 6)
The motor employs carbon brushes which are
consumable parts. Replace the carbon brush with
a new one when it becomes worn to its wear limit.
Always keep carbon brushes clean and ensure that
they slide freely within the brush holders.
Wear limit
0.67" (17 mm)
CAUTION
Using this portable grinder with a carbon brush
which is worn in excess of the wear limit will
damage the motor.
NOTE:
Use HITACHI carbon brush No. 88 indicated in
Fig. 6.
4. Replacing carbon brushes (Fig. 7):
<Disassembly>
(1) Loosen the D4 tapping screw retaining the tail
cover and remove tha tail cover.
10
No. of carbon brush
88
0.24" (6 mm)
(2) Use the auxiliary hexagonal wrench or small
screwdriver to pull up the edge of the spring
that is holding down the carbon brush. Remove
the edge of the spring toward the outside of
the brush holder.
(3) Remove the end of the pig-tail on the carbon
brush from the terminal section of brush holder
and then remove the carbon brush from the
brush holder.
<Assembly>
(1) Insert the end of the pi-tail of the carbon brush
in the terminal section of brush holder.
(2) Insert the carbon brush in the brush holder.
(3) Use the auxiliary hexagonal wrench or small
screwdriver to return the edge of the spring to
the head of the carbon brush.
(4) Mount the tail cover and tighten the D4 tapping
screw.
Carbon Brush Brush Holder
5. Service and repairs
All quality power tools will eventually require
servicing or replacement of parts because of wear
from normal use. To assure that only authorized
replacement parts will be used, all service and
repairs must be performed by a HITACHI
AUTHORIZED SERVICE CENTER, ONLY.
6. Service parts list
CAUTION
Repair, modification and inspection of Hitachi
Power Tools must be carried out by a Hitachi
Authorized Service Center.
Spring
Fig. 7